Hello, What kind of taste was it? If it was a kind of metallic taste then that could be to do with a few things, 1) Dehydration and dry mouth, 2) Medication that you might be on, like antibiotics such as Tetracycline, Clarithromycin, and Metronidazole. (which you did say). 3) Gingivitis and other Dental Issues, 4) Sinus problems and lastly an excess or a deficiency of one type of nutrient or another.
I hope this helps a little and I am glad it has sorted itself out, Good luck with your levels, I hope they get back to normal too!